If you can only find the leak internally with a
camera on a stick, it seems it will be impossible to repair from the inside without some major disassembly.
I had the same problem on my boat ,in the 2 inch thick strip planking,caused by creatures called kupang in
Malaysia. They look like small snails, about 1/2 inch diameter with a
single crab like
claw that digs a hole in the hull to make a nest, from which they feed off the passing nutrients. When they dig in to the hull they don't ingest the wood and
bottom paint so it does not kill them. I developed four
leaks on my way to a ship yard in
Thailand from near
Singapore,and I used underwater epoxy on the inside together with a number of pre prepared patches for a temporary fix. The patches were six inch square 1/4 inch
plywood with roofing nails protruding through each corner. When a leak occurred,I buttered bitchumen on to the
plywood; then a covering of cheese cloth to stop the bitchumen from squeezing out; followed by another layer of bitchumen . I was then able to dive on the leak and attach the patch with only a snorkel.
My leak also started out as a small weep, but when I poked at it with my finger it became a finger sized hole with only the
paint on the inside of the hull to stop a torrent.
I also tried the quick fix cement trick, but I found that if there was too much water flow, or trying it on the outside of the hull under water,then the cement would wash away before it could set up.
What I did to repair the damage in
Thailand is a another saga.
Good luck and don't ignore the small stuff.
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